The tornado can be summoned at Deborah's Cliff, which is at the far western portion of the northern section of the Jam Wasteland. The tornado is summoned by pressing down for a few seconds with this crystal equipped while facing the cliff. The tornado will take you from the western-most part of the game to the most easterly mansion, Bodley Mansion. Just to the west of this mansion is another water logged area that the crystal can help you enter (hold down for a few seconds at the shore), which will help you obtain the Flame Whip and enter Laruba Mansion.